Question

Which of the following type(s) of tolerances is/are used in editing GIS data?

• A. Snap tolerance
• B. Weed tolerance
• C. Grain tolerance
• D. Polygon tolerance

Hint:

Remember: {snap} (merge nearby points), {weed} (delete too-close vertices), {grain} (sampling/spacing while tracing). These stabilize topology and generalization during editing.

Answer 1

The Correct Option is A

During digitizing/editing, software uses several distance tolerances to control feature creation and cleanup.
Snap tolerance forces vertices/edges within a set distance to coincide (avoids gaps/overshoots).
Weed tolerance removes redundant vertices closer than the set threshold (line simplification).
Grain tolerance (used in some GIS/CAD digitizers) controls the minimum spacing of sampled points while tracing, acting like a densify/sampling threshold.
“Polygon tolerance” is not a standard editing tolerance per se (area features are affected by the same snap/weed/grain settings), hence (D) is not chosen.